JP2017141680A - Variable displacement compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily allow discharge capacity control by secure flowing of a refrigerant through a pressure discharge passage even when foreign matters accumulate in a filter provided in the pressure discharge passage.SOLUTION: A variable displacement compressor comprises a fixed orifice 160a arranged in a pressure discharge passage which provides communication between a crank chamber and a suction chamber 119, and a first filter 180 which is provided on a downstream side of the fixed orifice 160a and covers an opening 161 on the suction chamber 119 side of the pressure discharge passage, compresses a refrigerant sucked in a cylinder bore from the suction chamber 119 and discharges the same into a discharge chamber. The first filter 180 has net members 184, 185 of predetermined aperture sizes and comprises a bypass passage 186 which provides communication between the opening 161 of the pressure discharge passage and the suction chamber 119 while bypassing the net members 184, 185 and has a flow passage cross-sectional area larger than the flow passage cross-sectional area of the fixed orifice 160a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to the structure of a variable capacity compressor.

  For example, a reciprocating variable displacement compressor used in a vehicle air conditioning system includes a housing, and a discharge chamber, a suction chamber, a crank chamber, and a cylinder bore are defined in the housing. A swash plate is tiltably connected to a drive shaft extending in the crank chamber, and a conversion mechanism including the swash plate converts the rotation of the drive shaft into a reciprocating motion of a piston disposed in the cylinder bore. The reciprocating motion of the piston performs the steps of sucking the refrigerant from the suction chamber into the cylinder bore, compressing the sucked refrigerant, and discharging the compressed refrigerant to the discharge chamber.

The stroke length of the piston, that is, the discharge capacity of the variable capacity compressor is variable by changing the pressure in the crank chamber (control pressure). In order to control the discharge capacity, the variable capacity compressor is provided with a pressure supply passage (supply passage) in which a discharge chamber and a crank chamber are communicated and a capacity control valve is interposed, and the crank chamber and the suction chamber. And a pressure release passage (bleeding passage) in which a throttle is provided.
Furthermore, the variable capacity compressor disclosed in Patent Document 1 is provided with a filter in the pressure relief passage so that foreign matter flowing from the crank chamber to the suction chamber can be captured.
When the filter is provided in the flow path, it is necessary to select an opening so that the mesh member of the filter is not completely clogged. For example, in variable capacity compressors, mesh members with openings of about 100 μm to 200 μm are often used.

JP2011-111984

  However, there are, for example, several μm to several tens of μm of foreign matter existing in the crank chamber including wear powder generated at the sliding portion in the variable capacity compressor, and these sizes of foreign matters are disclosed in Patent Document 1. The conventional filter (a mesh member having a mesh size of about 100 μm to 200 μm) cannot capture. Minute foreign matter in the crank chamber passes through the filter and is discharged to the discharge chamber via the suction chamber and the cylinder bore. Most of the foreign matter is discharged to the external refrigerant circuit, and a part is again passed through the capacity control valve. It enters the crank chamber and circulates in the variable capacity compressor. In particular, a minute foreign matter of 20 μm or less enters the support hole that supports the valve body of the capacity control valve interposed in the pressure supply passage and becomes a factor that hinders the smooth operation of the valve body. In some cases, the valve body may be stuck (locked) and become uncontrollable.

  The present invention has been made to solve such a problem, and the object of the present invention is to allow the refrigerant to flow through the pressure release passage even if foreign matter accumulates on the filter provided in the pressure release passage. An object of the present invention is to provide a variable capacity compressor that can ensure the discharge capacity control well.

  In order to achieve the above-described object, in the variable capacity compressor of the present invention, a cylinder block in which a plurality of cylinder bores are defined, a piston disposed in each of the cylinder bores, and one end side of the cylinder block are closed. A front housing that forms a crank chamber in cooperation with the cylinder block, a valve plate that closes the other end of the cylinder block, and a cylinder plate that is disposed so as to face the cylinder block. A discharge chamber disposed in a ring shape, a suction chamber disposed radially inside the discharge chamber, a suction passage connecting the suction port and the suction chamber, and a discharge passage connecting the discharge port and the discharge chamber And a housing formed of the front housing, the cylinder block, and the rear housing. A drive shaft rotatably supported in the drive shaft, a swash plate that is coupled to the drive shaft and rotates synchronously with the drive shaft, and an inclination angle with respect to the drive shaft is variable, and the rotation of the swash plate is A conversion mechanism that converts the piston into reciprocating motion, a pressure supply passage that communicates the discharge chamber and the crank chamber, a control valve that is disposed in the pressure supply passage, and a communication between the crank chamber and the suction chamber. A pressure relief passage, a throttle disposed in the pressure relief passage, and a first filter provided downstream of the throttle and covering the suction chamber side opening of the pressure relief passage, A variable capacity compressor that compresses refrigerant sucked into the cylinder bore from the suction chamber and discharges the refrigerant into the discharge chamber, wherein the first filter has a mesh member with a predetermined mesh, and the mesh member The depressurization passage and the suction chamber communicate with each other, and Characterized by comprising a first bypass passage having a flow path cross-sectional area than the flow path cross-sectional area.

  Preferably, the mesh member has an opening of 20 μm or less.

  Preferably, the flow path cross-sectional area of the first bypass path is set to be equal to or smaller than the minimum flow path cross-sectional area of the region other than the throttle of the pressure release path.

  Further preferably, the opening on the inner side of the first filter of the first bypass passage is directed in the radial direction of the opening on the suction chamber side of the pressure release passage and is spaced apart from the extension line of the opening. Good.

  Preferably, the first filter includes an annular member that covers the periphery of the opening of the pressure release passage, and a foreign matter trapping portion that is continuous from the annular member and in which the mesh member is integrated, The first bypass path may be formed between the abutting member with which the annular member abuts and the annular member.

  Preferably, the annular member has a groove formed on a surface with which the abutting member abuts, and the groove constitutes the first bypass path.

  Preferably, the first filter is arranged in a region other than an extension region of the opening of the suction passage to the suction chamber.

  Preferably, the suction chamber further includes a second filter that covers the first filter and has a net member, and the first bypass path is provided between the first filter and the second filter. The space and the inside of the first filter communicate with each other, and the mesh of the mesh member of the second filter may be set larger than the mesh of the mesh member of the first filter.

  Preferably, the suction passage further includes a third filter having a mesh member, and a second bypass path that bypasses the mesh member of the third filter is provided, and the mesh of the mesh member of the third filter is provided. The opening may be set to be larger than the mesh opening of the mesh member of the first filter, and the flow passage cross-sectional area of the second bypass passage may be set larger than the minimum flow passage cross-sectional area of the suction passage.

  According to the variable capacity compressor of the present invention, since the first bypass passage that bypasses the net member and communicates the pressure release passage and the suction chamber is provided, even if foreign matter accumulates on the first filter, Can pass through the first bypass passage and flow into the suction chamber from the pressure relief passage. As a result, the refrigerant is discharged from the crank chamber to the suction chamber via the pressure release passage and the first bypass passage, thereby enabling the inclination of the swash plate and the discharge capacity control.

  Since the first bypass passage has a flow passage cross-sectional area equal to or larger than the flow passage cross-sectional area of the pressure release passage, even if the net member of the first filter is completely blocked, the minimum distance from the crank chamber to the suction chamber The channel cross-sectional area is defined by the restriction. Thereby, even if the net member of the first filter is completely closed, it is possible to execute the discharge capacity control satisfactorily.

It is sectional drawing of the compressor which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the detail of the 1st filter attachment part in the compressor which concerns on 1st Embodiment. It is sectional drawing which shows the detail of the 1st filter attachment part in the compressor which concerns on 2nd Embodiment. It is sectional drawing of the compressor which concerns on 3rd Embodiment. It is sectional drawing of the compressor which concerns on 4th Embodiment.

  FIG. 1 is a cross-sectional view of a variable capacity compressor (hereinafter referred to as a compressor 100) according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing details of the first filter 180 mounting portion in the compressor 100 according to the first embodiment.

  The compressor 100 according to the first embodiment of the present invention is employed in, for example, a vehicle air conditioning system and is provided in a circulation path through which a refrigerant (for example, R134a) circulates. In the circulation path of the vehicle air conditioning system, a compressor 100, a radiator (condenser), an expander (expansion valve), and an evaporator are inserted in order in the refrigerant flow direction. The compressor 100 performs a series of processes including a refrigerant suction process, a suction refrigerant compression process, and a compressed refrigerant discharge process to circulate the refrigerant in the circulation path.

  As shown in FIG. 1, the compressor 100 is a swash plate type variable capacity compressor, and includes a substantially cylindrical cylinder block 101 having a plurality of cylinder bores 101 a and a front housing 102 connected to one end of the cylinder block 101. And a rear housing 104 connected to the other end of the cylinder block 101 via a valve plate 103 (contact member).

  A crank chamber 105 is defined by the cylinder block 101 and the front housing 102, and the drive shaft 106 extends vertically through the crank chamber 105. The drive shaft 106 passes through an annular swash plate 107 disposed in the crank chamber 105, and the swash plate 107 is hinged to a rotor 108 fixed to the drive shaft 106 via a connecting portion 109. Accordingly, the swash plate 107 can tilt while moving along the drive shaft 106.

  Between the rotor 108 and the swash plate 107, a coil spring 110 that urges the swash plate 107 toward the minimum inclination angle is mounted around the drive shaft 106, while the coil spring 110 is sandwiched between the rotor 108 and the swash plate 107. On the opposite side, that is, between the swash plate 107 and the cylinder block 101, a coil spring 111 that biases the swash plate 107 toward the maximum inclination angle is mounted around the drive shaft 106.

  The drive shaft 106 passes through the boss portion 102a protruding to the outside of the front housing 102, and its tip extends to the outside. A shaft seal device 112 is inserted between the drive shaft 106 and the boss portion 102a to block the inside and the outside of the front housing 102 from each other. The drive shaft 106 is rotatably supported by bearings 113, 114, 115, and 116 in the radial direction and the thrust direction. The drive shaft 106 is rotationally driven by a driving force transmitted from an external drive source such as an engine to the tip protruding from the boss portion 102a.

  A piston 117 is disposed in the cylinder bore 101a, and a tail portion protruding into the crank chamber 105 is formed integrally with the piston 117. A pair of shoes 118 is disposed in a recess 117a formed in the tail portion, and the shoes 118 are in sliding contact with the outer peripheral portion of the swash plate 107 so as to be sandwiched therebetween. Therefore, the piston 117 and the swash plate 107 are interlocked with each other via the shoe 118, and the piston 117 reciprocates in the cylinder bore 101a by the rotation of the drive shaft 106 (conversion mechanism).

  A suction chamber 119 and a discharge chamber 120 are defined in the rear housing 104. The discharge chamber 120 is annularly disposed inside the rear housing 104, and the suction chamber 119 is disposed radially inside the discharge chamber 120. The suction chamber 119 can communicate with the cylinder bore 101 a through a suction hole 103 a provided in the valve plate 103. The discharge chamber 120 communicates with the cylinder bore 101a through a discharge hole 103b provided in the valve plate 103. A cylinder gasket 150, a suction valve forming body 160, a valve plate 103, a discharge valve forming body 130 (contact member), a head gasket are arranged between the cylinder block 101 and the rear housing 104 in order from the cylinder block 101 side. 170 is interposed. The suction hole 103 a is opened and closed by a suction valve configured in the suction valve formation body 160, and the discharge hole 103 b is opened and closed by a discharge valve configured in the discharge valve formation body 130.

  The front housing 102, the center gasket (not shown), the cylinder block 101, the cylinder gasket 150, the suction valve forming body 160, the discharge valve forming body 130, the head gasket 170, and the rear housing 104 are fastened by a plurality of through bolts 140. A housing of the compressor 100 is formed.

  A muffler 121 is provided outside the cylinder block 101. A muffler casing 122 constituting the muffler 121 is joined to a muffler base 101b formed integrally with the cylinder block 101 via a seal member (not shown). The muffler casing 122 and the muffler base 101b define a muffler space 123. The muffler space 123 communicates with the discharge chamber 120 via a discharge passage 124 that passes through the rear housing 104, the valve plate 103, and the muffler base 101b.

  A discharge port 122a is formed in the muffler casing 122, and a check valve 200 is disposed in the muffler space 123 so as to block between the discharge passage 124 and the discharge port 122a. Specifically, the check valve 200 opens and closes according to the pressure difference between the pressure on the discharge passage 124 side and the pressure on the muffler space 123 side, and closes when the pressure difference is smaller than a predetermined value. If larger, open.

  The discharge chamber 120 can communicate with the forward portion of the refrigerant circulation path via the discharge passage 124, the muffler space 123, and the discharge port 122 a, and this communication is interrupted by the check valve 200. On the other hand, the suction chamber 119 communicates with the return path portion of the refrigerant circulation path via a suction passage 104b and a suction port 104a provided in the rear housing 104.

  The rear housing 104 is connected to an electromagnetic control type capacity control valve (control valve) 300, and the capacity control valve 300 is inserted in the pressure supply passage 125. Part of the pressure supply passage 125 is formed from the rear housing 104 to the cylinder block 101 through the valve plate 103 so as to communicate between the discharge chamber 120 and the crank chamber 105.

  On the other hand, the suction chamber 119 communicates with the crank chamber 105 via the pressure release passage 127. The pressure release passage 127 includes a clearance between the drive shaft 106 and the bearings 115 and 116, a space 128, and a fixed orifice 160 a (throttle) formed in the valve plate 103.

  The suction chamber 119 is connected to the capacity control valve 300 independently of the pressure supply passage 125 through a pressure sensitive passage 126 formed in the rear housing 104. The capacity control valve 300 adjusts the opening of the pressure supply passage 125 that connects the discharge chamber 120 and the crank chamber 105, and controls the amount of refrigerant (discharge gas) introduced from the discharge chamber 120 into the crank chamber 105.

  The fixed orifice 160a is a portion that defines the minimum value of the cross-sectional area of the pressure release passage 127. The diameter of the fixed orifice 160a discharges blow-by gas that leaks to the crank chamber 105 side when the piston 117 compresses the gas. It has the smallest aperture necessary and sufficient.

  Therefore, the discharge capacity is controlled by adjusting the discharge gas introduction amount into the crank chamber 105 by the capacity control valve 300 to change the pressure in the crank chamber 105 and changing the inclination angle of the swash plate 107, that is, the stroke of the piston 117. can do. The capacity control valve 300 is an external control type capacity control valve that operates in response to an external signal. The capacity control valve 300 senses the pressure in the suction chamber 119 via the pressure sensing passage 126 and adjusts the amount of current supplied to the solenoid of the capacity control valve 300. As a result, the discharge capacity is controlled so that the pressure in the predetermined suction chamber 119 is maintained, and when the energization is turned off, the valve body is forcibly opened to minimize the discharge capacity.

  The opening on the suction chamber 119 side of the suction passage 104b is disposed outside the region (extension region) near the extension line of the opening 161 on the suction chamber 119 side of the pressure release passage 127.

  The suction chamber 119 is provided with a first filter 180 so as to cover the opening 161 of the pressure release passage 127. Foreign matter contained in the refrigerant flowing from the crank chamber 105 through the pressure release passage 127 and flowing into the suction chamber 119 is captured by the first filter 180.

  The first filter 180 has an annular plate-shaped opening member (annular member) 181 disposed around the opening 161 on the suction chamber 119 side of the pressure release passage 127 and a cylindrical shape integrated with the opening member 181. And a foreign matter catching part 182. The foreign matter catching part 182 has a cylindrical case 183 having one end opened and a plurality of openings on the side and an opening on the other end, a net member 184 attached to the side opening of the case 183, and a case 183. It is comprised by the net | network member 185 affixed on the opening part of the other end. Note that the case 183 and the net members 184 and 185 are both made of resin or the like, and the mesh members 184 and 185 have openings of 20 μm or less (for example, 10 μm). The opening member 181 has an inner edge connected to one end of the case 183 over the entire circumference, and an outer peripheral part protruding radially outward from the case 183 to form a flange.

The head gasket 170 has an insertion hole that is larger in diameter than the case 183 and smaller than the outer peripheral diameter of the opening member 181. The edge of the insertion hole in the head gasket 170 is slightly smaller than the thickness of the opening member 181 and is bent and protrudes toward the suction chamber 119 side. Then, the first filter 180 is disposed so as to cover the opening 161 of the fixed orifice 160a, and the flange that is the edge of the opening member 181 is sandwiched between the discharge valve forming body 130 and the edge of the insertion hole of the head gasket 170. Then, the housing is fastened by the through bolt 140 so that the opening member 181 is in close contact with the discharge valve forming body 130, and the first filter 180 is fixed to the valve plate 103 via the discharge valve forming body 130 while covering the opening 161. Is done.
The discharge valve forming body 130 corresponds to the contact member of the present invention with which the opening member 181 is contacted. The structure may be such that the opening member 181 is fixed in contact with the valve plate 103. In this case, the valve plate 103 corresponds to the contact member of the present invention.

  Furthermore, in the present embodiment, a bypass path 186 (first bypass path) that communicates the inside and the outside of the first filter 180 is provided. The bypass passage 186 has a radially extending groove provided on the contact surface of the opening member 181 with respect to the discharge valve forming body 130, and a notch (not shown) formed at the edge of the insertion hole of the head gasket 170. It is constituted by. By fixing the first filter 180 to the valve plate 103, a bypass path 186 extending in the radial direction is formed between the opening member 181 and the discharge valve forming body 130.

  The opening 186a inside the first filter 180 of the bypass passage 186 is arranged away from the extension line of the opening 161 on the suction chamber 119 side of the pressure release passage 127, and opens in the direction perpendicular to the extension line. ing.

  Further, the minimum flow passage cross-sectional area of the bypass passage 186 is set larger than the flow passage cross-sectional area of the fixed orifice 160a which is the minimum flow passage cross-sectional area of the pressure release passage 127, and the pressure release passage in a portion other than the fixed orifice 160a. 127 is set to be smaller than the flow path cross-sectional area.

  With the configuration as described above, in the compressor 100 according to the first embodiment, since the first filter 180 is provided so as to cover the opening 161 on the suction chamber 119 side of the pressure release passage 127, the crank chamber It is possible to suppress a minute foreign matter from entering the suction chamber 119 via the pressure release passage 127 from 105. Since the mesh openings 184 and 185 of the first filter 180 are, for example, 20 μm or less, the movement of minute foreign matter generated in the sliding portion or the like in the crank chamber 105 to the suction chamber 119 is suppressed. It is possible to prevent sticking of the valve body caused by foreign matter flowing into the capacity control valve 300 from the chamber 119 via the cylinder bore 101a and the discharge chamber 120.

  In the present embodiment, the bypass member 186 that bypasses the mesh members 184 and 185 of the first filter 180 and communicates the pressure release passage 127 and the suction chamber 119 is provided. Even if clogging occurs and clogging occurs, it is possible to allow the refrigerant to flow from the crank chamber 105 to the suction chamber 119 via the pressure release passage 127 and the bypass passage 186. As a result, even if the net members 184 and 185 of the first filter 180 are blocked by foreign matter, the refrigerant can be discharged from the crank chamber 105 by the pressure release passage 127 and the discharge capacity can be controlled.

  In particular, in the present embodiment, the flow passage cross-sectional area of the bypass passage 186 is set larger than the fixed orifice 160a that is the minimum value of the flow passage cross-sectional area of the pressure release passage 127, so that the first filter 180 is completely Even if all of the refrigerant discharged from the pressure release passage 127 to the suction chamber 119 passes through the bypass passage 186, the minimum flow path cross-sectional area in the flow path from the crank chamber 105 to the suction chamber 119 is fixed orifice. 160a. As a result, even if the first filter 180 is blocked by the accumulation of foreign matter, the function of the fixed orifice 160a is ensured, and the refrigerant discharge flow rate from the crank chamber 105 to the suction chamber 119 via the pressure release passage 127 is excessive. Without being restricted, it is possible to prevent a drop in the response accuracy of the discharge capacity control, and it is possible to execute the discharge capacity control well.

  Further, the flow passage cross-sectional area of the bypass passage 186 is set to be smaller than the flow passage cross-sectional area of the pressure release passage 127 other than the fixed orifice 160a, so that foreign matter flows into the suction chamber 119 through the bypass passage 186. Can be suppressed.

  Further, the opening 186a inside the first filter 180 of the bypass passage 186 is disposed away from the extension line of the opening 161 on the suction chamber 119 side of the pressure release passage 127, and faces the vertical direction with respect to the extension line. Since it is open, the refrigerant discharged from the opening 161 of the pressure release passage 127 does not go directly to the opening 186a of the bypass passage 186, and it is possible to prevent foreign matters mixed in the refrigerant from flowing into the bypass passage 186. Can do. Thereby, the fall of the collection performance of the 1st filter 180 by providing the bypass 186 can be suppressed.

  In addition, the first filter 180 is disposed in a region other than the extended region of the opening of the suction passage 104b to the suction chamber 119, and the foreign matter is collected in the net member 185 particularly at the bottom of the first filter 180. Thus, when the refrigerant flows into the suction chamber 119 from the suction passage 104b, the foreign matter is separated from the mesh member 185 of the first filter 180 and flows into the bypass passage 186 due to the flow of the refrigerant from the suction passage 104b. Can be suppressed. As described above, the setting of the opening position of the suction passage 104b can prevent foreign matters from flowing into the bypass passage 186 and passing through the first filter 180.

  Moreover, in this embodiment, since the groove | channel is formed in the contact surface with which the discharge valve formation body 130 contacts in the opening member 181 and the bypass path 186 is formed, the bypass path 186 can be formed easily.

  FIG. 3 is a cross-sectional view showing details of the first filter 180 mounting portion in the compressor 100 according to the second embodiment.

  As shown in FIG. 3, in the second embodiment, the opening member 181 in the first embodiment is not provided with a groove, and the radial direction of the opening member 181 is formed on the contact surface of the discharge valve forming body 130 of the valve plate 103. A bypass path 186 that communicates the inside and the outside of the first filter 180 is formed by the groove. Thereby, also in 2nd Embodiment, the bypass path 186 can be easily formed by forming a groove | channel similarly to 1st Embodiment.

FIG. 4 is a cross-sectional view of the compressor 100 according to the third embodiment.
As shown in FIG. 4, in the compressor 100 according to the third embodiment, foreign matter that enters the suction chamber 119 from the suction passage 104 b further than the compressor 100 according to the first embodiment or the second embodiment. The suction chamber 119 is provided with a second filter 190 that captures.

The second filter 190 has a cylindrical shape with both ends being open ends, and the valve plate 103 and the suction chamber 119 are arranged such that the circumferential surface on which the mesh member is disposed covers the radial direction of the first filter. It is arranged between the end walls. The opening end on one end side of the second filter 190 is fitted into a hole in the end wall of the suction chamber 119 to which the suction passage 104b is connected, and the opening end on the other end side of the head gasket 170 in which the bypass passage 186 is opened. It is in contact with the head gasket 170 at a portion radially outward from the edge of the insertion hole.
Therefore, the refrigerant flowing through the pressure release passage 127 flows into the second filter 190 together with the refrigerant flowing through the suction passage 104b.
Note that the opening of the second filter 190 is set larger than the opening of the first filter 180. For example, the aperture is set to about 100 μm to 200 μm.

  Therefore, in the third embodiment, even if the first filter 180 is completely clogged and foreign matter passes from the crank chamber 105 through the bypass 186, relatively large foreign matter is detected by the second filter 190. Can be captured. Thereby, in the compressor 100 of 3rd Embodiment, when the 1st filter 180 is completely clogged, the capture | acquisition performance of the foreign material which flows out from the crank chamber 105 rather than the compressor 100 of 1st Embodiment is improved. Can be improved.

FIG. 5 is a cross-sectional view of the compressor 100 according to the fourth embodiment.
As shown in FIG. 5, in the compressor 100 of the fourth embodiment, the third filter 195 that captures foreign matter is further sucked into the compressor 100 of the first embodiment or the second embodiment. It is provided in the passage 104b. The third filter 195 is a filter that uses a mesh member in the same manner as the first filter 180, and the mesh opening of the mesh member is set to be equal to the mesh opening of the mesh member of the first filter 180. . Further, the third filter 195 also includes a bypass passage 196 (second bypass passage) formed in the radial direction perpendicular to the extending direction of the suction passage 104b. The flow passage sectional area of the bypass passage 196 is set to be equal to or larger than the minimum flow passage sectional area of the suction passage 104b.

  Thereby, in the compressor 100 of 3rd Embodiment, the inflow of the very small foreign material from the suction port 104a to the suction chamber 119 can be suppressed, and the control failure of the capacity | capacitance control valve 300 by foreign material inflow is further suppressed. Can do. Even if the third filter 195 is blocked by the accumulation of foreign matter, the refrigerant can be circulated by the bypass 196 and the discharge of the refrigerant by the compressor 100 can be ensured. Since the bypass passage 196 is formed in a radial direction perpendicular to the extending direction of the suction passage 104b, when no foreign matter is accumulated on the third filter 195, the foreign matter is sucked through the bypass passage 196. Inflow into the chamber 119 can be suppressed.

  In addition, this invention is not limited to the said embodiment, About various detailed structures in the said embodiment, it can change suitably. Moreover, in the said embodiment, although this invention is applied to the compressor of a vehicle air conditioning system, this invention can be widely applied with respect to the compressor of another use.

100 compressor (variable capacity compressor)
101 Cylinder block 102 Front housing 103 Valve plate (contact member)
104 Rear housing 106 Drive shaft 107 Swash plate 117 Piston 125 Pressure supply passage 127 Release pressure passage 130 Discharge valve forming body (contact member)
160a Fixed orifice (throttle)
180 First filter 181 Opening member (annular member)
182 Foreign matter catching part 184, 185 Net member 186 Bypass path (first bypass path)
190 Second filter 195 Third filter 196 Bypass path (second bypass path)
300 Capacity control valve (control valve)

Claims (9)

A cylinder block in which a plurality of cylinder bores are defined;
Pistons respectively disposed in the cylinder bores;
A front housing that closes one end of the cylinder block and forms a crank chamber in cooperation with the cylinder block;
A valve plate for closing the other end of the cylinder block;
A discharge chamber disposed opposite to the cylinder block with the valve plate interposed therebetween, and disposed in a ring shape inside; a suction chamber disposed radially inside the discharge chamber; a suction port; and the suction chamber; A rear passage formed with a discharge passage connecting the suction passage and the discharge port and the discharge chamber;
A drive shaft rotatably supported in a housing constituted by the front housing, the cylinder block and the rear housing;
A swash plate that is coupled to the drive shaft and rotates synchronously with the drive shaft, and the inclination angle of the drive shaft is variable;
A conversion mechanism for converting rotation of the swash plate into reciprocating motion of the piston;
A pressure supply passage communicating the discharge chamber and the crank chamber;
A control valve disposed in the pressure supply passage;
A pressure release passage communicating the crank chamber and the suction chamber;
A throttle disposed in the pressure relief passage;
A first filter provided downstream of the throttle and covering the suction chamber side opening of the pressure relief passage;
A variable capacity compressor that compresses the refrigerant sucked into the cylinder bore from the suction chamber and discharges the refrigerant into the discharge chamber;
The first filter has a mesh member with a predetermined opening,
A variable capacity comprising a first bypass passage that bypasses the mesh member, communicates the pressure relief passage and the suction chamber, and has a flow passage cross-sectional area equal to or larger than the flow passage cross-sectional area of the throttle. Compressor.   The variable capacity compressor according to claim 1, wherein the mesh member has an opening of 20 μm or less.   3. The variable capacity according to claim 1, wherein a flow path cross-sectional area of the first bypass path is set to be equal to or smaller than a minimum flow path cross-sectional area of a region other than the throttle of the pressure release path. Compressor.   The opening on the inner side of the first filter of the first bypass passage is arranged in the radial direction of the opening on the suction chamber side of the pressure release passage and is spaced apart from the extension line of the opening of the pressure release passage. The variable capacity compressor according to any one of claims 1 to 3, wherein the variable capacity compressor is provided. The first filter includes an annular member that covers the periphery of the opening of the pressure release passage, and a foreign matter trapping portion that is continuously provided from the annular member and in which the mesh member is integrated.
5. The variable according to claim 1, wherein the first bypass path is formed between an abutting member with which the annular member abuts and the annular member. Capacity compressor.   The variable capacity compressor according to claim 5, wherein a groove is formed on a surface of the annular member that contacts the contact member, and the groove forms the first bypass path.   The variable capacity compressor according to any one of claims 1 to 6, wherein the first filter is disposed in a region other than an extension region of an opening of the suction passage to the suction chamber. The suction chamber further includes a second filter that covers the first filter and has a net member;
The first bypass path communicates the space between the first filter and the second filter and the inside of the first filter,
8. The variable according to claim 1, wherein the mesh opening of the mesh member of the second filter is set larger than the mesh opening of the mesh member of the first filter. Capacity compressor. The suction passage further includes a third filter having a mesh member,
Providing a second bypass that bypasses the net member of the third filter;
The mesh opening of the third filter mesh member is set to be greater than or equal to the mesh opening of the first filter mesh member,
9. The variable capacity compressor according to claim 1, wherein a flow passage cross-sectional area of the second bypass passage is set larger than a minimum flow passage cross-sectional area of the suction passage. .

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